Cycles Worksheet
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Our atmosphere is ____% nitrogen gas
78
Plants release 430-470 billion tons of oxygen during the process of ________.
Photosynthesis
Plants use CO2 in the process of _______ to make _______ and _______.
Photosynthesis/Sugar/Oxygen
Animals use oxygen in the process of _______ to make more CO2
Respiration
Oxygen is vital for _______ by animals, a process which produces CO2 and water
Respiration
